213123005 has 8 divisors (see below), whose sum is σ = 255843672. Its totient is φ = 170434368.

The previous prime is 213122971. The next prime is 213123041. The reversal of 213123005 is 500321312.

It can be written as a sum of positive squares in 4 ways, for example, as 36711481 + 176411524 = 6059^2 + 13282^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213123005 - 2¹² = 213118909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10547 + ... + 23183.

It is an arithmetic number, because the mean of its divisors is an integer number (31980459).

Almost surely, 2^213123005 is an apocalyptic number.

It is an amenable number.

213123005 is a deficient number, since it is larger than the sum of its proper divisors (42720667).

213123005 is a wasteful number, since it uses less digits than its factorization.

213123005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16015.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 213123005 is about 14598.7329929689. The cubic root of 213123005 is about 597.3242003067.

Adding to 213123005 its reverse (500321312), we get a palindrome (713444317).

The spelling of 213123005 in words is "two hundred thirteen million, one hundred twenty-three thousand, five".